Do you think they will be able to create some type of medicine which is going to be effective against the virus any time soon, because we all see that the vaccines maybe won't be the key to beating the virus? 
Answering the title itself, I would say "ANYTHING IS POSSIBLE AS LONG AS THERE IS SOMEONE TRYING"
But in regards to contents of the post, they will recreate the vaccine to certain extent that will enhance it even further, and that's for sure. As the virus is clearly mutating and currently now in Delta. Though a Cure maybe a little farfetch, but maybe in the far future, they will be able to create those, but not in the near future.